| Protocol | ID | DPI version | Protocol group | Protocol type | Update | Description |
|---|---|---|---|---|---|---|
| at-echo | 204 | 12.2 | Instant messengers | Built-in | As needed | AT-Echo is a legacy AppleTalk diagnostic protocol used to test reachability and latency. |
| at-zis | 206 | 12.2 | Instant messengers | Built-in | As needed | AT-ZIS is a zero-initiation sync used in Apple collaboration environments for state resolution. |
| qmtp | 209 | 12.2 | Built-in | As needed | QMTP (Quick Mail Transfer Protocol) is a fast, secure email transfer protocol for large-volume mail systems. | |
| z39.50 | 210 | 12.2 | Application servers | Built-in | As needed | Z39.50 is a standard protocol for searching and retrieving information from remote databases, used in libraries. |
| 914c/g | 211 | 12.2 | Remote control | Built-in | As needed | Texas Instruments 914C/G Terminal |
| anet | 212 | 12.2 | Network services | Built-in | As needed | A protocol for ANet (Access Network), providing general access network services. |
| ipx | 213 | 12.2 | Network services | Built-in | As needed | A protocol for IPX (Internetwork Packet Exchange), a Novell networking protocol. |
| vmpwscs | 214 | 12.2 | Virtualization | Built-in | As needed | VM PWSCS (IANA official) |
| softpc | 215 | 12.2 | Network services | Built-in | As needed | SoftPC remote desktop and virtualization protocol used in early terminal emulators. |
| CAIlic | 216 | 12.2 | Application servers | Built-in | As needed | CAILIC is a license manager for terminal emulation and legacy system access tools. |
| dbase | 217 | 12.2 | Printing | Built-in | As needed | A database printing service for managing print jobs and output from a database system. |
| mpp | 218 | 12.2 | Built-in | As needed | MPP (Multi-Purpose Protocol) is used in gaming and media systems for secure state sync and chat. | |
| uarps | 219 | 12.2 | Network services | Built-in | As needed | UDP ARP Sync protocol mirrors address resolution entries across local subnets. |
| imap3 | 220 | 12.2 | Built-in | As needed | IMAP3 is an older email access protocol, replaced by IMAP4 for folder and message sync. | |
| fln-spx | 221 | 12.2 | Remote control | Built-in | As needed | a Novell SPX-based file network service. |
| rsh-spx | 222 | 12.2 | Remote control | Built-in | As needed | Remote Shell over SPX protocol (Novell NetWare). |
| cdc | 223 | 12.2 | Application servers | Built-in | As needed | CDC (Change Data Capture) protocol is used for tracking and syncing database changes securely. |
| masqdialer | 224 | 12.2 | Instant messengers | Built-in | As needed | MasqDialer handles encrypted PPP session dialup and routing configuration. |
| direct | 242 | 12.2 | Network services | Built-in | As needed | A protocol for direct data exchange, a generic networking service. |
| sur-meas | 243 | 12.2 | Network services | Built-in | As needed | Surveillance Measurement protocol gathers environmental or security sensor data. |
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